-18.91% is the change from 661 to 536
Calculation steps:
[( 536 - 661 ) ÷ 661] x 100 = -18.91%
Formula
Percentage change = [(536 - 661) / 661] x 100
Subtract the new number by the original number
536 - 661 = -125
-125 ÷ 661 = -0.18910741301059
-0.18910741301059 x 100 = -18.91%